A police spokesman said: “There is no specific drug-driving campaign, but officers have been trained in drug recognition field impairment tests which they will use if they suspect a driver is unfit to drive, despite passing a breathalyser test.”

The head of Surrey’s mobile support division, Ch Insp Martin Clark, said: “We want people to think before they go out to parties and other social events about whether they are going to drink and, if so, think about how they are getting home.

“We want them to find an alternative to driving, or getting a lift from another driver who may also have been drinking.”